Rephrase managed guest sessions warning

Managed guest session "Full disclosure" warning rephrased to be more
similar to the "Light disclosure" one.

Bug: 910218
Change-Id: If59d4a80794196cceeca98ede19ca49d99191398
Reviewed-on: https://chromium-review.googlesource.com/c/1477266
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#633307}
2 files changed